PDB-6yjv: Crystal structure of unliganded MGAT5 (alpha-1,6-mannosylglycoprotein 6-beta-N-acetylglucosaminyltransferase V) luminal domain with a Lys329-Ile345 loop truncation, in complex with UDP-2-deoxy-2-fluoroglucose and biantennary pentasaccharide M592